Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Common Opal
Hydrated silica (SiO2 " nH2O)
mineral
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Quartzite Pebble
Meta-quartzite
metamorphic
Septarian Nodule (Dragon Stone)
Septarian concretion (Complex of Calcite, Aragonite, and Limestone/Clay)
sedimentary
Sandstone with Calcite Vein
Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling
sedimentary
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic
Micaceous Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Fossilized Coral
Scleractinian Anthozoa (Fossilized Calcium Carbonate, CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Limonite Pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2
mineral
Ironstone Concretion (Limonite/Goethite)
Goethite-rich Concretion (FeO(OH))
sedimentary
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Mineral in Metamorphic Rock
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive)
igneous
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz on Greenstone
Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite with Quartz Veining
Quartzite (primarily SiO2)
metamorphic
Charoite
Charoite - K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Greisen
Greisen
Metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Basalt with Secondary Mineral Inclusions
Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)
igneous
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Red Quartzite
Quartzite (SiO2)
metamorphic
Schist
Mica Schist
metamorphic
Pink Granite (Alkali Feldspar Granite)
Phaneritic Felsic Igneous Rock (composed primarily of KAlSi3O8, SiO2, and NaAlSi3O8)
igneous
Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Banded Agate (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Chalk (Limestone variant)
Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary